iAQ-core sensor library

This is an Arduino (compatible) library for the AMS indoor air quality sensor iAQ-core C and iAQ-core P.

It was tested on the TI CC3200 LaunchPad with the Arduino compatible Energia v1.6.10E18 IDE. If it works with other boards let me know.

TI CC3200 LaunchPad Notes

The TI CC3200 LaunchPad I2C Bus runs in FastMode (400 kHz) but sadly the iAQ-core sensors can only handle 100 kHz, so some modificatons are necessary: Modify ~/.energia15/packages/energia/hardware/cc3200/1.0.2/libraries/Wire/Wire.cpp

--- a/hardware/cc3200/libraries/Wire/Wire.cpp
+++ b/hardware/cc3200/libraries/Wire/Wire.cpp
@@ -48,7 +48,7 @@ void TwoWire::begin(void)
        MAP_PinTypeI2C(PIN_01, PIN_MODE_1);
        MAP_PinTypeI2C(PIN_02, PIN_MODE_1);
        MAP_PRCMPeripheralReset(PRCM_I2CA0);
-       MAP_I2CMasterInitExpClk(I2C_BASE, F_CPU, true);
+       MAP_I2CMasterInitExpClk(I2C_BASE, F_CPU, false);
 }
 
 void TwoWire::beginTransmission(uint8_t address)
@@ -69,9 +69,7 @@ uint8_t TwoWire::I2CTransact(unsigned long ulCmd)
        MAP_I2CMasterControl(I2C_BASE, ulCmd);
 
        while((MAP_I2CMasterIntStatusEx(I2C_BASE, false)
-                       & (I2C_INT_MASTER | I2C_MRIS_CLKTOUT)) == 0) {
-               if(!MAP_I2CMasterBusy(I2C_BASE)) return -1;
-       }
+                       & (I2C_INT_MASTER | I2C_MRIS_CLKTOUT)) == 0) { }
 
        /* Check for any errors in transfer */
        if(MAP_I2CMasterErr(I2C_BASE) != I2C_MASTER_ERR_NONE) {

References:

• energia/Energia issue: CC3200: Issues with I²C energia/Energia#444
• energia/Energia issue: CC3200 i2c at 100KHz doesn't work energia/Energia#941
• energia/cc3200-core issue: CC3200 I²C at 100KHz doesn't work energia/cc3200-core#7